Day: March 21, 2011

Mastering Exposure–Histograms Part 3

This is the third post in a series on the histogram. This post discusses the Rocky Mountain histogram, what it is, when you can get it, how to photograph and how to do the post processing.

This is the third post in a continuing series on the oft misunderstood but oh so important histogram.  In the first two posts we discussed the histogram in general.  If you missed them, click on these links.

Mastering Exposure – Histograms Part 1

Mastering Exposure – Histograms Part 2

Recap

To recap, the histogram displays a graph of the tonal values in the scene you are about to photograph.  It shows how the dynamic range of the scene matches and fits into the dynamic range of your camera’s sensor.  There are two critical pieces of information a histogram tells you:

  1. If your exposure is correct
  2. If you have problems capturing the dynamic range of the scene

To recap, the exposure is displayed by the position of the histogram curve within the boundaries of the graph area.  As you increase the exposure the histogram moves to the right.  As you decrease the exposure it moves to the left.  If the exposure is increased so that the histogram moves all the way up against the right side of the graph area you will have highlight clipping. Likewise, if it moves all the way to the left side you will have shadow clipping.

The dynamic range of the scene is displayed as the breadth of the histogram,  The wider the histogram the greater the dynamic range of the scene.  The narrower the histogram the lower the dynamic range.  When the histogram is so wide that it extends from one end of the graph area to the other you are facing a situation where your camera’s sensor will have a difficult time capturing the full dynamic range of the scene.  The worst case is you will have both highlight and shadow clipping.

Continue reading “Mastering Exposure–Histograms Part 3”

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Dewitt Jones Said It All

I was reading an article by Dewitt Jones in the latest Outdoor Photographer last night.  I always enjoy reading him; he is so positive and full of enthusiasm.  The title of the article was Don’t Prove…Improve!  He was recounting his experience when he got hired on as a National Geographic Photographer.  Dewitt was a little intimidated.  His new boss, Bob Gilka, gave him some advice that applies to us all.  He told Dewitt, “You don’t have to prove yourself, not to me or to the other photographers.  What I do demand that you do is improve yourself.  Every day….”

Dewitt goes on to write,

“[Gilka] understood that when we shoot from our own unique vision, there’s no reason to ‘prove’ ourselves…. There’s only one person on the planet who can do what we do, see as we see.

“Improve ourself?  That’s a different story.  There’s so much for all of us to learn to make our vision clearer, stronger, sharper.  And Gilka knew that the fastest way to learn is to trust and share rather than compete.”

Yep, I always enjoy reading Dewitt’s comments.  He is so positive.  And right on.

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